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Fixed Assets | 3 Months Ended
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Mar. 31, 2014
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets And Asset Retirement Obligations | 4. Fixed Assets Fixed Assets Fixed assets consisted of the following:
| March 31, 2014 |  | December 31, 2013
Pipelines and related assets | $ | 419,282 |  |  | $ | 338,920 |
Machinery and equipment | 176,256 |  |  | 173,092 |
Transportation equipment | 18,666 |  |  | 19,140 |
Marine vessels | 557,848 |  |  | 554,679 |
Land, buildings and improvements | 31,260 |  |  | 30,170 |
Office equipment, furniture and fixtures | 5,372 |  |  | 5,633 |
Construction in progress | 178,764 |  |  | 183,037 |
Other | 27,995 |  |  | 23,303 |
Fixed assets, at cost | 1,415,443 |  |  | 1,327,974 |
Less: Accumulated depreciation | (211,689 | ) |  | (199,230 | )
Net fixed assets | $ | 1,203,754 |  |  | $ | 1,128,744 |
Our depreciation expense for the periods presented was as follows:
| Three Months Ended March 31,
| 2014 |  | 2013
Depreciation expense | $ | 15,277 |  |  | $ | 10,491 |

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